using System;using System.Collections.Generic;using System.Drawing;using System.Drawing.Imaging;using System.IO;using System.Linq;using System.Net;using System.Text;using System.Threading.Tasks;namespace Test{class Program{static void Main(string[] args){string inputStr = "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";string time = "Ef1ae0cH2GI3Ef1cH2GI3KM7Ij5gL6";//DateTime.Now.Ticks.ToString("x");string boundary = "———-" + time;string boundary2 = "————" + time;string uploadUrl = "**";HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(uploadUrl);webrequest.Headers["X-Requested-With"] = "ShockwaveFlash/17.0.0.134";webrequest.Headers["Accept-Encoding"] = "gzip, deflate";webrequest.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.89 Safari/537.36";webrequest.Accept = "*/*";webrequest.ContentType = "multipart/form-data; boundary=" + boundary;webrequest.Method = "POST";StringBuilder sb = new StringBuilder();sb.Append("–");sb.Append(boundary);sb.Append("\r\n");sb.Append("Content-Disposition: form-data; name=\&;Filename\&;");sb.Append("\r\n");sb.Append("\r\n");sb.Append("1.png");sb.Append("\r\n");sb.Append("–");sb.Append(boundary);sb.Append("\r\n");sb.Append("Content-Disposition: form-data; name=\&;Filedata\&;; filename=\&;1.png\&;");sb.Append("\r\n");sb.Append("Content-Type: application/octet-stream");sb.Append("\r\n");sb.Append("\r\n");StringBuilder bs = new StringBuilder();bs.Append("\r\n");bs.Append("–");bs.Append(boundary);bs.Append("\r\n");bs.Append("Content-Disposition: form-data; name=\&;Upload\&;");bs.Append("\r\n");bs.Append("\r\n");bs.Append("Submit Query");bs.Append("\r\n");bs.Append("–");bs.Append(boundary + "–");string postHeader = sb.ToString();string postEnder = bs.ToString();byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader);byte[] boundaryBytes = Encoding.ASCII.GetBytes(postEnder);byte[] buffer = GetByteImage(inputStr);long length = postHeaderBytes.Length + boundaryBytes.Length + buffer.Length;webrequest.ContentLength = length;Stream requestStream = webrequest.GetRequestStream();requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);requestStream.Write(buffer, 0, buffer.Length);requestStream.Write(boundaryBytes, 0, boundaryBytes.Length);WebResponse response = webrequest.GetResponse();StreamReader sr = new StreamReader(response.GetResponseStream(), System.Text.Encoding.Default);//实例华一个流的读写器Console.WriteLine(sr.ReadToEnd());response.Close();requestStream.Close();Console.Read();}private static byte[] GetByteImage(string inputStr){byte[] arr = Convert.FromBase64String(inputStr);using (MemoryStream ms = new MemoryStream(arr)){using (Bitmap bmp = new Bitmap(ms)){using (MemoryStream stream = new MemoryStream()){bmp.Save(stream, ImageFormat.Png);stream.Position = 0;byte[] buffer = new byte[stream.Length];stream.Read(buffer, 0, buffer.Length);stream.Flush();return buffer;}}}}}}
公司提的新需求 上传剪贴板的图片
出于公司隐私保护这里我不贴图片服务器接口的地址，，主要这个地址没设权限
剪贴板取出来的数据是一个base64的字符串。经过一上午努力写出上传代码如上。
这里易出错的地方有2点
1.base64转出来的byte数组不能直接拿来写入stream必须将这个byte数组转换为bitmap再转成MemoryStream写入stream才可以。
2.webrequest.ContentType的-比下面报文中的-少2个。
面对这种需求 装一个fiddler2 然后正常上传分析报文 模拟一个相同的报文就好了
离开睁眼闭眼看见的城市，逃离身边的纷纷扰扰，
